<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部的警告区 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        show-icon
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <!-- :props="cateProps"  绑定级联选择框的配置对象 -->
          <!-- :options="CateList" 绑定数据源 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="CateList"
            expand-trigger="hover"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab标签区域 -->
      <el-tabs v-model="activeName" @tab-click="handletabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!--展开行  -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行  -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  size="mini"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  size="mini"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input> </el-form-item
      ></el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input> </el-form-item
      ></el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Params",
  data() {
    return {
      // 存储商品分类列表的数据
      CateList: [],
      // 级联选择框的配置对象
      cateProps: {
        // value是用来表示选中的那个值
        value: "cat_id",
        // label是表示选中后看到的那个值
        label: "cat_name",
        // children是用来指定父子节点的嵌套属性
        children: "children",
      },
      // 级联选择框双向绑定的数组
      selectedCateKeys: [],
      // 被激活的页签默认的名称
      activeName: "many",
      // 存储动态属性的参数
      manyTableData: [],
      // 存储静态属性的参数
      onlyTableData: [],
      // 控制添加参数/属性对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {},
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: {},
      //修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: "请输入参数名称",
            trigger: "blur",
          },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    // 获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("商品分类数据获取失败");
      } else {
        this.CateList = res.data;
        // console.log(this.CateList);
      }
    },
    // 级联选择框选中变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    // 这是tab页签点击事件处理函数
    handletabClick() {
      // this.handleChange();
      // console.log(this.activeName);
      this.getParamsData();
    },
    // 这是获取参数的列表数据（从级联选择框变化函数中抽离出来的）
    async getParamsData() {
      // console.log(this.selectedCateKeys);
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
      } else {
        // 证明选中的是三级数组
        // console.log(this.selectedCateKeys);
        //根据所选分类的id，和当前所处的面板，获取对应的参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: this.activeName },
          }
        );
        // console.log(res);
        if (res.meta.status !== 200) {
          return this.$message.error("获取参数列表失败");
        } else {
          res.data.forEach((item) => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(",") : [];

            // 控制文本框的显示与隐藏
            item.inputVisible = false;
            // 文本框中输入的值
            item.inputValue = "";
          });

          console.log(res.data);
          if (this.activeName === "many") {
            this.manyTableData = res.data;
          } else {
            this.onlyTableData = res.data;
          }
        }
      }
    },
    // 监听对话框的关闭事件，清空内容
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    // 点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        } else {
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName,
            }
          );
          if (res.meta.status !== 201) {
            return this.$message.error("添加参数失败");
          } else {
            this.$message.success("添加参数成功");
            this.addDialogVisible = false;
            this.getParamsData();
          }
        }
      });
    },
    // 点击按钮，展示修改参数的对话框
    async showEditDialog(attr_id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      // console.log(res);
      if (res.meta.status !== 200) {
        return this.$message.error("查询信息失败");
      }
      this.editForm = res.data;

      this.editDialogVisible = true;
    },
    //当表单关闭后，
    editDialogClosed() {
      // 清空表单数据
      this.$refs.editFormRef.resetFields();
    },
    // 点击按钮修改参数信息
    editParams() {
      //校验表单信息
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败");
        } else {
          this.$message.success("修改参数成功");
          this.getParamsData();
          this.editDialogVisible = false;
        }
      });
    },
    // 根据id删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该文件, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      // 用户取消了删除操作
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      }
      // 删除的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) return this.$message.error("删除参数失败");
      this.$message.success("删除参数成功");
      this.getParamsData();
      this.editDialogVisible = false;
    },
    // 文本框失去焦点或按下enter键都会触发
    async handleInputConfirm(row) {
      // trim()是去除字符串两端的空格
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      // 如果没有return，则证明输入的内容，需要做后续处理
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = true;
      // 需要发起请求，保存这次操作
      // const { data: res } = await this.$http.put(
      //   `categories/${this.cateId}/attributes/${row.attr_id}`,
      //   {
      //     attr_name: row.attr_name,
      //     attr_sel: this.activeName,
      //     attr_vals: row.attr_vals.join(","),
      //   }
      // );
      // if (res.meta.status !== 200) {
      //   return this.$message.error("修改参数项失败");
      // }
      // this.$message.success("修改参数项成功");
      this.saveAttrvals(row);
    },
    // 将对attr_vals 的操作，保存到数据库
    async saveAttrvals(row) {
      // 需要发起请求，保存这次操作
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: this.activeName,
          attr_vals: row.attr_vals.join(","),
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败");
      }
      this.$message.success("修改参数项成功");
    },
    // 点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true;
      // 让文本框自动获得焦点
      // $nextTick方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //删除对应的可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1);
      // 保存到数据库中
      this.saveAttrvals(row);
    },
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2];
      } else {
        return null;
      }
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      } else {
        return "静态属性";
      }
    },
  },
};
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0px;
}
.el-tag {
  margin: 5px;
}
.input-new-tag {
  width: 120px;
}
</style>